A three-dimensional flow field evaluation device for artificial valves

Abstract

The present invention discloses a three-dimensional flow field evaluation device for an artificial valve, comprising an experimental section, an outer shell, a first connecting element, a second connecting element, and a fixed clamping element. The experimental section is made of a silicone material, is elastic, and can simulate the elastic feedback of a real aorta. During the evaluation, the first connecting element and the second connecting element are used to fix the two ends of the experimental section, which can ensure that the experimental section is not torsion and stretching due to artificial loading when loaded into the inner cavity of the shell body, and can avoid prestress, thereby ensuring that the structure and feedback of the experimental section are closer to the real aortic section, and improving the accuracy of the evaluation. A liquid storage cavity is formed between the outer shell and the experimental section, and liquid is input into the liquid storage cavity. Since the experimental section is elastic, it can simulate the compliance of the aorta. Adjusting the liquid level height of the experimental medium in the liquid storage cavity can change the compliance size to meet different evaluation requirements. When conducting different evaluation experiments, different experimental sections can be replaced according to experimental requirements.

Description

Technical Field

[0001] The invention relates to the technical field of in vitro performance testing of artificial heart valves, and in particular to a three-dimensional flow field evaluation device for artificial valves. Background Art

[0002] Heart disease has long been one of the major threats to human health. According to global health statistics, more than 100 million people worldwide suffer from valvular heart disease (VHD). Valvular heart disease is associated with heart valve stenosis and regurgitation, which plagues people around the world, and the incidence rate increases with age. Survey data show that by 2019, the number of patients with valvular heart disease in my country has reached 36 million, and this number may reach 40 million by 2024. Aortic valve disease accounts for more than half of valvular heart disease, including aortic valve stenosis and aortic valve regurgitation, and is the main cause of death from valvular heart disease. The currently recognized effective treatment method is heart valve replacement surgery. Studies have shown that the annual demand for artificial heart valves in my country reaches more than 80,000, and with the gradual arrival of an aging society, the demand for artificial heart valves, especially aortic valve replacement, will inevitably increase.

[0003] Currently, artificial valves used for replacement include mechanical heart valves and biological artificial heart valves. Mechanical heart valves are mainly made of metals and other materials, including titanium alloys, pyrolytic carbon, polyester fiber, polyester, polytetrafluoroethylene and silicone. In order to avoid irreversible consequences after implantation, artificial heart valves need to undergo multiple evaluation experiments, including in vitro experiments, in vivo experiments and animal experiments. Among these evaluations, since in vitro experiments have the lowest cost and the shortest time, multiple in vitro experiments are often required to further optimize product design. The optimization of in vitro experimental methods contributes to the rapid iteration of product design. By establishing a physical model similar to the physiological conditions of the natural heart and conducting hemodynamic simulation experiments of artificial heart valves on this model, a series of hemodynamic parameters can be obtained. These parameters can not only be used directly to evaluate the quality of the valve, but also provide an objective evaluation before implantation in the human body to ensure that the quality of the valve meets the standards.

[0004] The in vitro hemodynamic performance test of the valve is an essential in vitro test direction for fully evaluating artificial heart valves. The particle image velocimetry (PIV) method recommended in the ISO 5840-1:2021 standard provides a feasible solution. Particle Image Velocimetry (PIV) is an optical measurement technology for measuring the velocity field of fluid flow. PIV technology can obtain high-resolution velocity distribution in the flow field and is widely used in fluid mechanics research, engineering applications and biomedicine. The basic principle of PIV technology is to add tracer particles to the fluid, and these particles move with the fluid. When the laser irradiates these particles, the particles scatter light, and the images captured by the high-speed camera can record the position changes of the particles. By correlating two images with a short time interval, the displacement of the particles can be calculated, thereby obtaining the velocity field of the fluid. Therefore, this method is suitable for studying complex flow phenomena, such as hemodynamics near the valve. By using PIV as an in vitro evaluation method, the velocity field of blood flow can be directly measured in a real physiological model, thereby more accurately reflecting the fluid mechanics environment around the valve. By capturing the movement of the valve during opening and closing, as well as the changes in the surrounding flow field, the interaction and impact between blood flow and valve movement can also be deeply analyzed. This test not only helps to evaluate the performance of the valve, such as orifice area and transvalvular pressure difference, but also provides important basis for the durability of the valve structure.

[0005] Materials and equipment such as tracer particles and laser systems are relatively unified. To further improve the accuracy of PIV test results, it is necessary to consider the design and optimization of the experimental device.

[0006] There are two designs of PIV test sections currently used to image valves.

[0007] One method is to adopt an integrated rigid structure design, in which holes are made in a hard transparent acrylic block by subtractive manufacturing to form a flow channel, or by casting with materials such as silicone resin. The final result is an inelastic hard rigid flow channel, which cannot restore the elastic force effect of the aorta under the boundary of pulsating flow conditions, and thus cannot reflect the influence of elastic blood vessels on the flow field in the flow channel, and has poor bionics.

[0008] The second method is to use 3D printing to create a flexible silicone test segment corresponding to the established three-dimensional vascular model. However, since the silicone surface cannot be highly smooth, scattering will occur when the laser is irradiated, affecting the brightness and accuracy of the experimental image. Therefore, the silicone test segment cannot be directly photographed during the actual experiment. The silicone test segment must be fixed and immersed in the liquid storage cavity to match the refractive index. The process of fixing the silicone test segment in the liquid storage cavity adds additional difficulty to the experimental setting, and there is also the risk of the test segment falling off during the experiment due to poor fixation. Summary of the invention

[0009] The purpose of the present invention is to provide a three-dimensional flow field evaluation device for an artificial valve to solve the problems existing in the above-mentioned related technologies, enhance the bionics of the experimental section, fix the two ends of the experimental section separately, avoid prestress, and improve the evaluation accuracy.

[0010] To achieve the above object, the present invention provides the following solutions:

[0011] The present invention provides a three-dimensional flow field evaluation device for an artificial valve, comprising:

[0012] An experimental section, which is made of silicone material, matches the human heart artery, has a cylindrical structure, and can be connected to external experimental equipment;

[0013] A shell, the shell is sleeved on the outside of the experimental section, and a liquid storage cavity is formed between the inner wall of the shell and the outer wall of the experimental section, the liquid storage cavity can be connected to the external experimental medium, and the side wall of the shell is made of a transparent material;

[0014] A fixing assembly, the fixing assembly comprising a first connecting element, a second connecting element and a fixing clamping element, the first connecting element and the second connecting element are respectively detachably connected to the two ends of the experimental section and extend out of the shell, a sealing ring is arranged between the first connecting element and the second connecting element and the shell, the first connecting element and the second connecting element are both connected to the experimental section, the fixing clamping element is arranged in the second connecting element, and the fixing clamping element can fix the artificial valve to be tested.

[0015] Preferably, the shell is a split structure, and the shell includes a shell body and a top cover arranged on the top of the shell body, and the first connecting element presses the top cover onto the shell body.

[0016] Preferably, the shell body is a prismatic structure.

[0017] Preferably, the first connecting element includes a connecting tube and a pressure plate, one end of the connecting tube is plug-connected to the experimental section, and the other end of the connecting tube passes through the top cover and is connected to the pressure plate, so that the pressure plate presses the top cover onto the shell body, and the sealing ring is arranged between the connecting tube and the pressure plate.

[0018] Preferably, the compression disc is sleeved on the outside of the connecting pipe and the two are threadedly connected;

[0019] The connecting pipe is a stepped structure, and has a connecting ring, which is located at the bottom of the top cover. The connecting ring and the axial end face of the shell body are both provided with positioning rings, and the bottom of the top cover has a positioning groove matched with the positioning ring.

[0020] Preferably, the second connecting element includes a connecting disk and a fixing tube, one end of the connecting disk is plug-connected to the experimental section, the other end of the connecting disk extends out from the shell body, the sealing ring is arranged between the connecting disk and the shell body, the fixing tube is plug-connected to the connecting disk and communicated with the experimental section, and the fixing clamping element is located in the fixing tube and is clamped to the fixing tube.

[0021] Preferably, the connecting tube and the end of the connecting plate connected to the experimental section are both pagoda plug structures.

[0022] Preferably, the connecting plate and the fixing tube are both made of hard material.

[0023] Preferably, the second connecting element further comprises a connecting block, wherein the connecting block is disposed between the connecting disk and the fixing tube, and the connecting block can be connected to an external experimental device.

[0024] Preferably, the shell is connected to a liquid pipeline and a gas pipeline, the liquid storage cavity is connected to the external experimental medium via the liquid pipeline, and the liquid storage cavity is connected to the external environment via the gas pipeline, and control valves are provided on the liquid pipeline and the gas pipeline.

[0025] Compared with the related art, the present invention has achieved the following technical effects: the artificial valve three-dimensional flow field evaluation device of the present invention includes an experimental section, an outer shell and a fixed component, the experimental section is made of silicone material, the experimental section matches the aortic root and aortic sinus of the human heart, the experimental section is a cylindrical structure, and can be connected with external experimental equipment; the outer shell is sleeved on the outside of the experimental section, and a liquid storage cavity is formed between the inner wall of the outer shell and the outer wall of the experimental section, the liquid storage cavity can be connected with the external experimental medium, and the side wall of the outer shell is made of transparent material; the fixed component includes a first connecting element, a second connecting element and a fixed clamping element, the first connecting element and the second connecting element are respectively detachably connected to the two ends of the experimental section and extend out of the outer shell, sealing rings are arranged between the first connecting element and the second connecting element and the outer shell, the first connecting element and the second connecting element are both connected to the experimental section, the fixed clamping element is arranged in the second connecting element, and the fixed clamping element can fix the artificial valve to be tested.

[0026] The artificial valve three-dimensional flow field evaluation device of the present invention has an experimental section made of silicone material, which is elastic and can simulate the elastic feedback of the real aorta; during the evaluation, the experimental section is placed in the shell, and the two ends of the experimental section are fixed by the first connecting element and the second connecting element. The upper and lower ends of the experimental section are fixed respectively, which can ensure that the experimental section has no twisting and stretching of artificial loading when it is loaded into the inner cavity of the shell body, and can avoid prestress, thereby ensuring that the structure and feedback of the experimental section are closer to the real aortic section, and improving the evaluation accuracy. A liquid storage cavity is formed between the shell and the experimental section, and the experimental medium is input into the liquid storage cavity. The experimental medium adopts liquid, that is, part of the structure of the experimental section is located in the experimental medium. Since the experimental section has elasticity, it can simulate the compliance of the aorta, and adjusting the liquid level height of the experimental medium in the liquid storage cavity can change the compliance size to meet different evaluation requirements. In addition, the experimental medium is introduced into the liquid storage cavity, and the influence of the refractive index change on the measurement of the PIV flow field can be effectively reduced when measuring through the shell. When conducting different evaluation experiments, different experimental sections can be replaced according to experimental requirements to improve the flexibility and adaptability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is an axonometric schematic diagram of a three-dimensional flow field evaluation device for an artificial valve disclosed in an embodiment of the present invention;

[0029] Figure 2 It is a schematic front view of a three-dimensional flow field evaluation device for an artificial valve disclosed in an embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of the cross-section structure of the artificial valve three-dimensional flow field evaluation device disclosed in an embodiment of the present invention;

[0031] Figure 4 It is a partial structural schematic diagram of the artificial valve three-dimensional flow field evaluation device disclosed in an embodiment of the present invention.

[0032] In the figure: 100, a three-dimensional flow field evaluation device for an artificial valve;

[0033] 1. Experimental section; 2. Shell; 3. First connecting element; 4. Second connecting element; 5. Fixed clamping element; 6. Shell body; 7. Top cover; 8. Connecting pipe; 9. Pressure plate; 10. Connecting ring; 11. Connecting plate; 12. Fixed pipe; 13. Connecting block. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The purpose of the present invention is to provide a three-dimensional flow field evaluation device for an artificial valve to solve the problems existing in the above-mentioned related technologies, enhance the bionics of the experimental section, fix the two ends of the experimental section separately, avoid prestress, and improve the evaluation accuracy.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Embodiment 1

[0038] This embodiment provides a three-dimensional flow field evaluation device 100 for an artificial valve. Figure 1-Figure 4 , including an experimental section 1, an outer shell 2 and a fixing component, the experimental section 1 is made of silicone material, the experimental section 1 matches the aortic root and aortic sinus of the human heart, the experimental section 1 is a cylindrical structure, and can be connected with external experimental equipment; the outer shell 2 is sleeved on the outside of the experimental section 1, and a liquid storage cavity is formed between the inner wall of the outer shell 2 and the outer wall of the experimental section 1, and the liquid storage cavity can be connected with the external experimental medium, and the side wall of the outer shell 2 is made of transparent material; the fixing component includes a first connecting element 3, a second connecting element 4 and a fixed clamping element 5, the first connecting element 3 and the second connecting element 4 are respectively detachably connected to the two ends of the experimental section 1, and extend out of the outer shell 2, and sealing rings are arranged between the first connecting element 3 and the second connecting element 4 and the outer shell 2, the first connecting element 3 and the second connecting element 4 are both connected with the experimental section 1, the fixed clamping element 5 is arranged in the second connecting element 4, and the fixed clamping element 5 can fix the artificial valve to be tested.

[0039] The artificial valve three-dimensional flow field evaluation device 100 of the present invention, the experimental section 1 is made of silicone material, has elasticity, and can simulate the elastic feedback of the real aorta; during the evaluation, the experimental section 1 is placed in the shell 2, and the two ends of the experimental section 1 are fixed by the first connecting element 3 and the second connecting element 4. The upper and lower ends of the experimental section 1 are fixed respectively, which can ensure that the experimental section 1 is not torsion and stretching of artificial loading when it is loaded into the inner cavity of the shell body 6, and prestress can be avoided, thereby ensuring that the structure and feedback of the experimental section 1 are closer to the real aortic section, and improving the accuracy of the evaluation. A liquid storage cavity is formed between the shell 2 and the experimental section 1, and the experimental medium is input into the liquid storage cavity. The experimental medium adopts liquid, that is, part of the structure of the experimental section 1 is located in the experimental medium. Since the experimental section 1 has elasticity, it can simulate the compliance of the aorta. Adjusting the liquid level height of the experimental medium in the liquid storage cavity can change the compliance size, meet different evaluation needs, realize the three-dimensional flow field simulation of the artificial valve, and facilitate the evaluation of the performance of the artificial valve. In addition, by introducing the experimental medium into the liquid storage cavity, the influence of the refractive index change on the measurement of the PIV flow field can be effectively reduced when measuring through the outer shell 2.

[0040] It should also be noted that the design process of Experimental Section 1 is as follows:

[0041] In order to make the compliance of the experimental segment 1 as the aortic root model match the compliance of the human aorta, and combine the silicone properties of the personalized 3D printing material, it is necessary to design the thickness of the experimental segment 1. The inner diameter of the experimental segment 1 is predicted using a nonlinear model.

[0042] (1)

[0043] In the formula, a is the outer diameter of the experimental section 1 when it is not stressed, b is the inner diameter of the experimental section 1 when it is not stressed, Δa is the change in outer diameter, Δb is the change in inner diameter.

[0044] Normally, human blood vessels can automatically adjust their diameter according to the flow of blood to maintain appropriate blood pressure and flow. The physical quantity that describes the degree of stretching of blood vessels when subjected to blood flow or changes in blood pressure is called vascular compliance. It is an indicator of the adaptability of blood vessels to pressure changes. It is also an important indicator for judging how well in vitro simulated blood vessels simulate physiological conditions in terms of vascular mechanics. Considering that the silicone material model used in experimental section 1 is DWVM40, with a transmittance of 91%, a hardness of 40A, a tensile strength of 6MPa, and an elongation at break of 290%. The following formula is used to calculate the change in inner diameter after applying the average stress:

[0045] (2)

[0046] In the formula, q is the average pressure inside the experimental section 1, E is the elastic modulus, μ is the Poisson's ratio (the Poisson's ratio of silicone rubber DWVM40 can be obtained by referring to the Shore hardness-Poisson's ratio correspondence table), and the required compliance can be obtained by formula (2):

[0047] (3)

[0048] In the formula, Eta is the compliance along the outer diameter of the vessel, Etb For the compliance along the inner diameter of the blood vessel, for the silicone material DWVM40, μ =0.5. Thus, the thickness of the experimental section 1 simulating the root of the aorta can be designed appropriately.

[0049] In this specific embodiment, the inner diameter and outer diameter of the experimental section 1 are inferred by combining the compliance parameters of the human heart's aorta with the material parameters of the experimental section 1, so that the compliance of the experimental section 1 matches the compliance of the human aorta, providing convenience for subsequent artificial valve evaluation.

[0050] This experimental section 1 can also match the experimental platform for measuring the in vitro arterial flow circulation system, as well as the PIV shooting and particle imaging system, and achieve its near-physiological requirements from three perspectives: near-physiological anatomical structure (designing a human aortic root model with three sinusoidal structures), near-physiological vascular mechanics (designing a vascular wall thickness that matches the mechanical properties of vascular materials and simulating the physiological compliance of the aorta), and near-physiological hemodynamics (measuring the in vitro pulsating flow environment to reproduce the in vivo physiological pressure and flow waveforms).

[0051] The housing 2 is a split structure, which is convenient for the installation of the experimental section 1 and the maintenance of the device. The housing 2 includes a housing body 6 and a top cover 7 arranged on the top of the housing body 6, so that the housing 2 can enclose a liquid storage cavity with the experimental section 1. The top cover 7 is pressed and connected to the housing body 6 to ensure the sealing of the housing 2. The top of the experimental section 1 extends out from the top cover 7. The first connecting element 3 is connected to the extended part of the experimental section 1 and abuts against the top cover 7 to ensure the stability of the experimental section 1.

[0052] The shell body 6 can adopt a prismatic structure, and the side wall of the shell body 6 has multiple planes to facilitate equipment observation. When using PIV technology for measurement, the shooting camera must be parallel to a plane of the shell body 6. In order to facilitate the installation of the camera to shoot various angles of the internal experimental section 1, the shell body 6 can adopt a prismatic structure with as many planes as possible to facilitate subsequent experimental operations. In this specific embodiment, the shell body 6 adopts a hexagonal prism structure.

[0053] Specifically, the first connecting element 3 includes a connecting tube 8 and a pressing plate 9. One end of the connecting tube 8 is plugged and connected to the experimental section 1 to ensure the sealing of the connection between the connecting tube 8 and the experimental section 1. The other end of the connecting tube 8 passes through the top cover 7 and is connected to the pressing plate 9, so that the pressing plate 9 presses the top cover 7 onto the shell body 6. In order to ensure the sealing of the device, sealing rings are provided between the top cover 7 and the connecting tube 8, and between the top cover 7 and the shell body 6, and double sealing ensures the sealing of the liquid storage cavity.

[0054] In this specific embodiment, the compression plate 9 is sleeved on the outside of the connecting tube 8 and the two are threadedly connected, which facilitates the assembly and disassembly of the compression plate 9 and the connecting tube 8; at the same time, the connection position of the compression plate 9 and the connecting tube 8 can be adjusted according to the experimental sections 1 of different lengths to adapt to the fixation of the experimental sections 1 of different lengths, improve the flexibility and adaptability of the fixing assembly, and ensure the fixation reliability of the experimental section 1. The connecting tube 8 and the compression plate 9 are threadedly connected, the connection is tight, and the adjustment is convenient.

[0055] Among them, the connecting tube 8 is a stepped structure, and the connecting tube 8 has a connecting ring 10, and the connecting ring 10 is located at the bottom of the top cover 7. The connecting ring 10 effectively prevents the connecting tube 8 from slipping out of the through hole of the top cover 7, further improving the working reliability of the first connecting element 3, and thus ensuring the stability of the experimental section 1 during the evaluation process. In other specific embodiments that can be realized by the present invention, the connecting ring 10 and the axial end face of the shell body 6 are both provided with a positioning ring, and the bottom of the top cover 7 has a positioning groove adapted to the positioning ring, which facilitates the installation and positioning of the top cover 7 and improves the convenience of operation.

[0056] More specifically, the second connecting element 4 includes a connecting disk 11 and a fixing tube 12. One end of the connecting disk 11 is plug-connected to the test section 1, and the other end of the connecting disk 11 extends out from the shell body 6. A sealing ring is provided between the connecting disk 11 and the shell body 6 to ensure the sealing of the liquid storage cavity. The fixing tube 12 is plug-connected to the connecting disk 11 and communicates with the test section 1. The fixing clamping element 5 is located in the fixing tube 12 and clamped with the fixing tube 12. The fixing tube 12 has a mounting position matching the fixing clamping element 5. After the artificial valve to be tested is fixed by the fixing clamping element 5, the fixing clamping element 5 clamps the artificial valve to be tested. The artificial valve to be tested and the fixing clamping element 5 are placed in the mounting position in the fixing tube 12 to support the artificial valve to be tested. The fixing tube 12 is connected to the test section 1 by the connecting disk 11, which ensures the smooth progress of the evaluation.

[0057] In other specific embodiments that can be realized by the present invention, the connection plate 11 and the fixing tube 12 can be made of hard materials, and the fixing tube 12 and the connection plate 11 are plugged to ensure the connection sealing. The connection plate 11 and the fixing tube 12 are made of hard materials, which provides a stable support for the fixation of the experimental section 1. The connection plate 11 and the shell body 6 can also be connected by threads, which is convenient for disassembly and assembly.

[0058] In practical applications, the connecting tube 8 and the connecting disk 11 can adopt a pagoda plug structure at one end that is plugged and connected to the experimental section 1. The pagoda plug structure is adopted to facilitate the plugging and connection of the connecting tube 8 and the connecting disk 11 with the experimental section 1. During the evaluation process, different experimental sections 1 can be easily replaced as needed; when evaluating experimental sections 1 of different specifications, the connecting tubes 8 and the connecting disk 11 of different specifications can be replaced accordingly to further enhance the flexibility and adaptability of the device. Since the experimental section 1 is made of elastic material, the connecting tube 8 and the connecting disk 11 can ensure the connection sealing when plugged and connected to the experimental section 1.

[0059] In actual application, the second connecting element 4 may further include a connecting block 13, which is disposed between the connecting plate 11 and the fixed tube 12. The connecting block 13 can be connected to an external experimental device to facilitate the evaluation experiment. In other specific embodiments that can be implemented by the present invention, the connecting block 13 can be fixedly connected to the fixed tube 12, or the fixed tube 12 presses the connecting block 13, which further facilitates the connection between the connecting block 13 and the external experimental device to ensure the smooth progress of the evaluation experiment.

[0060] Embodiment 2

[0061] The present embodiment provides an artificial valve three-dimensional flow field evaluation device 100, wherein the shell 2 is connected to a liquid pipeline and a gas pipeline, the liquid storage cavity is connected to an external experimental medium via the liquid pipeline, and the liquid storage cavity is connected to an external environment via the gas pipeline. The liquid pipeline can be used to conveniently introduce the experimental medium into the liquid storage cavity, and the gas in the liquid storage cavity can be smoothly discharged via the gas pipeline. Control valves are provided on both the liquid pipeline and the gas pipeline to conveniently control the working states of the liquid pipeline and the gas pipeline.

[0062] It should be explained here that water can be selected as the experimental medium, which is easy to obtain and convenient for the evaluation experiment. In actual applications, other liquid media can also be selected, but care must be taken to avoid affecting camera shooting.

[0063] The other structures of the artificial valve three-dimensional flow field evaluation device 100 of this embodiment are the same as those of the first embodiment and will not be described in detail here.

[0064] The artificial valve three-dimensional flow field evaluation device 100 of the present invention adopts a test section 1 made of silicone material, and the liquid level of the test medium in the liquid storage cavity is adjusted to change the compliance of the test section 1 and ensure the bionics of the test section 1. The upper and lower ends of the test section 1 are fixed by the first connecting element 3 and the second connecting element 4 respectively, which is convenient for disassembly and assembly, and at the same time, the test section 1 is kept in a non-prestressed state during the installation process, simplifying the difficulty of fixing the test section 1. The outer shell 2 adopts a prismatic structure, which can provide multiple image acquisition planes, which is conducive to improving the stability and accuracy of the evaluation.

[0065] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A three-dimensional flow field evaluation device for an artificial valve, characterized in that: include: An experimental section, which is made of silicone material, matches the human heart artery, has a cylindrical structure, and can be connected to external experimental equipment; A shell, the shell is sleeved on the outside of the experimental section, and a liquid storage cavity is formed between the inner wall of the shell and the outer wall of the experimental section, the liquid storage cavity can be connected to the external experimental medium, and the side wall of the shell is made of a transparent material; A fixing assembly, the fixing assembly comprising a first connecting element, a second connecting element and a fixing clamping element, the first connecting element and the second connecting element are respectively detachably connected to two ends of the test section and extend out of the shell, a sealing ring is arranged between the first connecting element and the second connecting element and the shell, the first connecting element and the second connecting element are both connected to the test section, the fixing clamping element is arranged in the second connecting element, and the fixing clamping element can fix the artificial valve to be tested; The shell is a split structure, comprising a shell body and a top cover arranged on the top of the shell body, the first connecting element presses the top cover onto the shell body; the first connecting element comprises a connecting pipe and a pressing plate, one end of the connecting pipe is plug-connected to the experimental section, the other end of the connecting pipe passes through the top cover and is connected to the pressing plate, so that the pressing plate presses the top cover onto the shell body, and the sealing ring is arranged between the connecting pipe and the pressing plate; the compliance of the experimental section can be changed by adjusting the liquid level of the experimental medium in the liquid storage cavity; The shell body is a prismatic structure.

2. The artificial valve three-dimensional flow field evaluation device according to claim 1, characterized in that: The compression disc is sleeved on the outside of the connecting pipe and the two are threadedly connected; The connecting tube is a stepped structure, and has a connecting ring, which is located at the bottom of the top cover. The connecting ring and the axial end face of the shell body are both provided with positioning rings, and the bottom of the top cover has a positioning groove matched with the positioning ring.

3. The artificial valve three-dimensional flow field evaluation device according to claim 1, characterized in that: The second connecting element includes a connecting disk and a fixing tube, one end of the connecting disk is plug-connected to the experimental section, the other end of the connecting disk extends out from the shell body, the sealing ring is arranged between the connecting disk and the shell body, the fixing tube is plug-connected to the connecting disk and communicates with the experimental section, and the fixing clamping element is located in the fixing tube and is clamped to the fixing tube.

4. The artificial valve three-dimensional flow field evaluation device according to claim 3, characterized in that: The connecting tube and the connecting plate are both of a pagoda plug structure at one end connected to the experimental section.

5. The artificial valve three-dimensional flow field evaluation device according to claim 3, characterized in that: The connecting plate and the fixing pipe are both made of hard materials.

6. The artificial valve three-dimensional flow field evaluation device according to claim 3, characterized in that: The second connecting element further comprises a connecting block, which is arranged between the connecting plate and the fixing tube, and the connecting block can be connected to an external experimental device.

7. The artificial valve three-dimensional flow field evaluation device according to any one of claims 1 to 6, characterized in that: The shell is connected with a liquid pipeline and a gas pipeline. The liquid storage cavity is connected with the external experimental medium by the liquid pipeline, and the liquid storage cavity is connected with the external environment by the gas pipeline. Control valves are arranged on the liquid pipeline and the gas pipeline.

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